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Diagnosis of ABS
In the case of system failure may conduct diagnosis. Multiple units ABS can not be adjusted and in the event of failure replaced.
| Fig. 7.23. Numbering conclusions ABS computer connector
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Check the electrical circuits made on the ABS computer connector plug block (Fig. 7.23). It does not connect extension cords screening devices (voltmeter or ohmmeter) to the computer connector plugs. To do this, remove the plastic protective cover from the pads connector from the supply electrical wires or use the adapter socket. Make sure that the pin numbering on the connector computer connector matches the pin numbering of the transition connector pads. Before you replace the hydraulic unit, computer or other expensive machines, it is recommended to make a thorough review of the device using the ABS ?�CONSULT?� company Nissan. In order to verify the ignition off, disconnect the plug connector ECU. All other connectors ABS system must be connected. Brake light switch is also not to be disconnected. Verification is performed in accordance with the Table. 7.2 and 7.3.
Table 7.2 Check electrical circuits ABS Number verification | Connecting device | Test condition | The expected result of the measurement | Possible fault location | 1 | Conclusion "4" connector relay and "mass" | Ignition off | U = Uakk. Baht. | Fuse D (30 A) or electric | 2 | Conclusion "4" connector relay and "mass" | Also | Fuses (30 A) or electric | 3 | The output "1" connector of the brake switch and "mass" | " | Fuse number 14 (10 A) or electric | 4 | The output "1" of the computer and the "mass" | Ignition ON | " | Fuse number 12 (7.5 A) or electric | 5 | Conclusion "30" computer and "mass" | " | Fuse ?��8 (10 A) or electric | 6 | Conclusion "7" diagnostic connector and "mass" | " | Fuse ?��7 (7,5 A) or electric | 7 | Conclusion "19" hydraulic unit connector and the "mass" | " | Supply relay solenoid valves | 8 | Conclusion "48" computer and "mass" | The ignition is turned off, the brake pedal is released | U = 0 | Brake light switch | 9 | Conclusions "28", "29" or "39" computer and "mass" | Ignition off. The computer is connected to the "masses" (the battery is disconnected) | R??0,5 O m | Wiring or connection point "weight" |
Table 7.3 Test wheel speed sensors Number verification | The output of the computer connector | Check sensor | Test condition | The expected result of the measurement | Possible fault location | 2/1 | "15" and "14" | The front right wheel | The ignition switch or appliance is switched off and the starter | 0.8-1.2 kW | Sensor wiring or wire | 2/2 | "9" and "10" | Front left wheel | 2/3 | "11" and "38" | The rear right wheel | 2/4 | "13" and "12" | Rear left wheel |
Before the diagnostics ensure the tightness of the vacuum amplifier, in the absence of compression brake hoses and tightness. Add a brake liquid in a tank system to a normal level. In operations with plug shoes, pay attention to the status of their findings, the presence of the spring locks and rubber gaskets. Driving electric circuit of the ABS system is shown in the color tab at the end of the book.
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